In a sting operation, PPA officials took rides on SideCar and found the drivers were unlicensed.

Philadelphia Magazine's Victor Fiorillo was riding in a SideCar in an effort to review the service, which had recently launched in the city, when his driver got the call from a SideCar employee to pull over and drop off his passengers.

SideCar operates with a mobile app similar to Uber, allowing people to call cars and drivers to their current location. But unlike Uber, which typically uses licensed taxi or limo drivers, SideCar allows ordinary car owners to sign up to drive passengers—whether or not they're licensed.